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converter.go
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/
converter.go
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package main
import (
"github.com/aktau/gomig/db/common"
"log"
)
var (
VERBOSE = true
)
type tempEntities struct {
r common.Reader
views map[string]string
projections map[string]ProjectionConfig
}
func createTempEntities(r common.Reader, views map[string]string, projections map[string]ProjectionConfig) *tempEntities {
t := &tempEntities{r, views, projections}
t.Create()
return t
}
func (t *tempEntities) Create() {
for name, body := range t.views {
if VERBOSE {
log.Printf("converter: creating view '%v'\n", name)
}
err := t.r.CreateView(name, body)
if err != nil {
log.Println("converter: error while creating view", name, body, err)
}
}
for name, proj := range t.projections {
if VERBOSE {
log.Printf("converter: creating projection '%v'\n", name)
}
err := t.r.CreateProjection(name, proj.Body, proj.Engine, proj.Pk, nil)
if err != nil {
log.Println("converter: error while creating projection", name, proj.Body, proj.Pk, err)
}
}
}
func (t *tempEntities) Erase() {
for name, _ := range t.views {
if VERBOSE {
log.Printf("converter: dropping view '%v'\n", name)
}
err := t.r.DropView(name)
if err != nil {
log.Println("converter: error while dropping view", name, err)
}
}
for name, _ := range t.projections {
if VERBOSE {
log.Printf("converter: dropping projection '%v'\n", name)
}
err := t.r.DropProjection(name)
if err != nil {
log.Println("converter: error while dropping projection", name, err)
}
}
}
func Convert(r common.ReadCloser, w common.WriteCloser, options *Config, verbosity int) error {
tempViews := createTempEntities(r, options.Views, options.Projections)
defer tempViews.Erase()
tables := r.FilteredTables(options.OnlyTables, options.ExcludeTables)
/* sort the tables according to only tables if "only tables" was
* specified. This is a primitive way to be able to specify some
* ordering among the tables. */
OrderTableByNamesList(tables, options.OnlyTablesList)
/* override types if specified in the options */
for _, table := range tables {
/* is this table a projection? */
meta, ok := options.Projections[table.Name]
if !ok {
continue
}
/* see if any of the columns require a different type than the
* one we derived */
for _, col := range table.Columns {
newtype, ok := meta.Types[col.Name]
if !ok {
continue
}
col.Type = common.SimpleType(newtype)
col.RawType = newtype
}
}
if !options.SuppressDdl {
createTables(tables, w)
}
if options.Truncate {
truncateTables(tables, w)
}
if !options.SuppressData {
if options.Merge {
for _, srcTable := range tables {
/* is this table a projection? */
var extraDstCond string
if meta, ok := options.Projections[srcTable.Name]; ok {
extraDstCond = meta.Conditions
}
if VERBOSE {
log.Println("converter: merging table", srcTable.Name)
}
dstTableName := strmap(srcTable.Name, options.TableMap)
err := w.MergeTable(srcTable, dstTableName, extraDstCond, r)
if err != nil {
return err
}
}
} else {
writeData(tables, w)
}
}
createIndices(tables, w)
createConstraints(tables, w)
return nil
}
func strmap(srcname string, m map[string]string) string {
if m == nil {
return srcname
}
mapped, ok := m[srcname]
if !ok {
return srcname
}
return mapped
}
func createTables(tables []*common.Table, w common.Writer) error {
return nil
}
func truncateTables(tables []*common.Table, w common.Writer) error {
return nil
}
func writeData(tables []*common.Table, w common.Writer) error {
return nil
}
func createIndices(tables []*common.Table, w common.Writer) error {
return nil
}
func createConstraints(tables []*common.Table, w common.Writer) error {
return nil
}